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Nitrogen dioxide gas standard substance in carbon dioxide and preparation method and application thereof

A gas standard substance, nitrogen dioxide technology, applied in nitrogen dioxide, nitrogen oxides/oxyacids, preparation of test samples, etc., to achieve the effect of improving stability, good stability, and ensuring stability

Pending Publication Date: 2020-04-14
广东省计量科学研究院(华南国家计量测试中心)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But nitrogen dioxide gas standard substance in carbon dioxide has not been reported in the prior art

Method used

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  • Nitrogen dioxide gas standard substance in carbon dioxide and preparation method and application thereof
  • Nitrogen dioxide gas standard substance in carbon dioxide and preparation method and application thereof
  • Nitrogen dioxide gas standard substance in carbon dioxide and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation of nitrogen dioxide gas standard substance in embodiment 1 carbon dioxide

[0027] Including the following steps:

[0028] (1) Purity analysis of high-purity carbon dioxide:

[0029]Use a gas chromatograph equipped with a plasma emission detector (PED) to analyze and confirm the purity and impurities of high-purity carbon dioxide (nominal purity ≥ 99.999%), and to measure the content of hydrogen, oxygen, nitrogen, total hydrocarbons, and carbon monoxide in the carbon dioxide raw material gas Detection, detection method reference: GB / T 37182-2018 Gas Analysis Plasma Emission Gas Chromatography [S]. Among them, the gas chromatograph with PED detector includes one 4m Porapak Q column (60-80 mesh), three 2m 5A molecular sieve columns (40-60 mesh), and 0.5m CST column (60-80 mesh) 1. For the analysis of high-purity carbon dioxide impurities, the specific conditions of the established gas chromatography analysis method include: the carrier gas is high-purit...

Embodiment 2

[0059] Embodiment 2 uniformity investigation

[0060] The uniformity of the reference material is an important index to measure the performance of the reference material, and it is also the material basis for the accurate transmission of the value of the reference material. The characteristics of the reference material should be uniform, that is, their characteristics remain unchanged within a certain subdivision range. The homogeneity test of gas standard substance is to describe the process that after the preparation of gas standard substance is completed, each component is fully mixed and uniform in the gas cylinder, and the value of each component changes with the pressure in the gas cylinder, and its characteristic value Ability to maintain uniformity and stability. That is commonly referred to as standard gas mixing time inspection and standard gas depressurization experiment inspection, the specific uniformity inspection and result analysis are as follows.

[0061] (1)...

Embodiment 3

[0069] Embodiment 3 stability investigation

[0070] In order to investigate the long-term stability of the standard gas and determine its validity period, a 12-month investigation was carried out on the mixed gas. The present invention investigates the stability of the standard substance of nitrogen dioxide gas in carbon dioxide according to the technical specifications of the standard substance and in line with the principle of tight first and sparse later. The second time, record the concentration data of the gas standard substance, and carry out the t-factor test on the test results. The results are shown in Table 10, the data show that in the 12-month stability investigation, the regression coefficient |b of the statistical calculation of the analysis measurement results 1 |are less than t 0.95,n-2 ×s(b 1 ), that is, within the 95% confidence interval, there is no significant difference in the stability of the gas samples in the gas cylinder, indicating that the compon...

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Abstract

The invention discloses a nitrogen dioxide gas standard substance in carbon dioxide. A preparation method of the nitrogen dioxide gas standard substance comprises the following steps: (1), measuring the purity of feed gas; (2), carrying out gas cylinder pretreatment; (3), diluting high-purity nitric oxide with high-purity carbon dioxide by adopting a weighing method, and then adding high-purity oxygen to prepare intermediate gas; (4), diluting the intermediate gas step by step by using high-purity carbon dioxide to prepare a nitrogen dioxide gas standard substance in the carbon dioxide; and (5), carrying out uniformity investigation and stability investigation on the prepared gas standard substance, and carrying out valuation on the gas standard substance. With the preparation method provided by the invention, formation of a nitrogen tetroxide dimer in the filling process and decomposition of nitrogen dioxide can be prevented effectively; the relative expansion uncertainty of the prepared nitrogen dioxide gas standard substance in the carbon dioxide is 2% (k=2); the uniformity and stability are good, the valid period is 12 months; and the requirements of food, medicine and other industries for detection and traceability of the nitrogen dioxide contents in carbon dioxide products can be met.

Description

technical field [0001] The invention belongs to the technical field of gas standard substances, and in particular relates to a gas standard substance of nitrogen dioxide in carbon dioxide and a preparation method and application thereof. Background technique [0002] Carbon dioxide is currently the most widely used gaseous food additive in the world, and its quality index is directly related to the health of consumers. In the beverage industry, in addition to Coca-Cola and Pepsi, there are many other carbonated beverages in China, and a large amount of food-grade carbon dioxide needs to be supplied. Due to the fact that the production technology, equipment and testing methods have not been truly standardized, the product quality varies. Consumers are very concerned about its quality. The current national standard uses naphthalene ethylenediamine hydrochloride spectrophotometry for the analysis of nitrogen oxides in carbon dioxide in food additives. "Carbon dioxide" standard...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/38G01N30/02C01B21/36
CPCG01N1/28G01N1/38G01N30/02C01B21/36G01N2001/2893G01N2001/386
Inventor 贾相锐周阳尹强叶丽芳毛沅文
Owner 广东省计量科学研究院(华南国家计量测试中心)
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